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This is possibly something you can do yourself - provided you plan to have the car repainted or are okay with a near color match. Each spider crack has to be traced and ground out with a small Dremel tip to the very end.  It can then be filled with marine colored epoxy if it is normal color (like red, black, white).  West Marine has a system that uses resin and a powder to fill such crevices too.

Image result for fixing spider cracks in gelcoat

Here's article using the West products -

http://www.chuckbrandt.com/body_work.htm

Yes - spider cracks only go thru the non-flexible gel coat (usually).  You have to get to the fiberglass base for a permanent repair.  You can fill surface without grinding but it won't last long.

Often caused by like a baseball hitting the hood/fender or a stone thrown up in the wheel well.  The previous picture shows it on a boat where the hull flexes - so similar to near door hinges.  You have to remove the inflexible gel coat where it is cracked and fill it in with something strong that really bonds well (so don't use Bondo or sanding putty as they do neither). 

Image result for fixing spider cracks in gelcoat

Had a black hulled 38' Sea Ray that had a little doc rash - two six inch scratches down to the glass. First repair estimate was $2500 not including haul out. Second estimate was more reasonable but still extraordinarily expensive. Generally, marine work is more expensive than auto repair so shop around (recently had a local marina charge me $100 for replacing two dead light bulbs!) Try to get a reference if you can as not all work is equal especially if color needs to be matched.

Ouch, that's some high gloss!  I'd want to find where the stress is coming from and address that before doing the cosmetic fix.  Do you have stop straps to keep doors from flying open?  On CMCs the inner to the outer door panel is bonded together with what looks like std pink Bondo which doesn't offer strength. it could maybe be repaired with gorilla hair or kitty hair fiberglass mix from inside the door to relieve stress points.

Footman loops are  also available from West Marine.com in stainless steel.  I used two "peal and stick" foam pads about 2" diameter on each door. One on the door and one adjacent to it on the panel in the front door jamb area.  Works like a champ. No drilling and creating stress areas. Takes about 5 minutes to install. The foam pads never permanently crush because they only have pressure on them when the door is opened all the way............Bruce

 

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