Skip to Main Content »

Keeping Gelcoat Fiberglass Blotch Free

A Blotchy or Streaky finish

A blotchy or streaked appearance is what can occur when:

  1. The user waits before drying the treated surface (as one does with wax but 303® is not a wax and not used like wax).
  2. The user uses way too much product (common one should be able to do a 40` fiberglass RV the first time with no more than 1 quart of 303® A. Protectant).
  3. The user continues to use the same drying cloth to "wipe dry" after that cloth has become damp with 303®. A 303®'d surface cannot be wiped dry with a damp cloth.

The correction for a smudgy, blotchy appearance (brought about by using too much 303® and/or then not wiping the surface "completely dry" before the water in the 303® evaporates) is:

  1. Take a clean, absorbent cloth such as an old towel. Fill a bucket 2/3 full of clear water. Soak the towel in the bucket, then wring out about 2/3 of the water. Using the wet towel, wipe a 2' x 2' area of smudged fiberglass, getting that area wet with water.
  2. Then, with a soft, clean, absorbent, DRY cloth, wipe that area completely dry. What happens here is the water causes the unabsorbed, unbonded excess 303® polymer on the surface to instantly go into solution so it's easily wiped away. The finish left after this is the beautiful, glossy, repellent finish expected with `303®'.
  3. Reapplication: Spray on, then immediately wipe completely dry. This process is much like "Windexing" a window, but takes less product. On a fiberglass RV, the caps start to fade first. It's necessary to redo the sides once for every 3-5 times you do the caps.